Grammar is the study of rules governing the use of language. The set of rules governing a particular language is also called the grammar of the language; thus, each language can be said to have its own distinct grammar. Grammar is part of the general study of language called linguistics.

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A prescriptive grammar presents authoritative norms for a particular language, and tends to deprecate non-standard constructions. Traditional grammars are typically prescriptive. Prescriptive grammars are usually based on the prestige dialects of a speech community, and often specifically condemn certain constructions which are common only among lower socioeconomic groups, such as the use of "ain't" and double negatives in English. Though prescriptive grammars remain common in pedagogy and foreign language teaching, they have fallen out of favor in modern academic linguistics, as they describe only a subset of actual language usage.

A descriptive grammar attempts to describe actual usage, avoiding prescriptive judgments. Descriptive grammars are bound to a particular speech community, and attempt to provide rules for any utterance considered grammatically correct within that community. For example, in many dialects of English, the use of double negatives is very common, though ungrammatical from the point of view of a prescriptive English grammar. A descriptive grammar of a speech community where "I didn't do nothing" is acceptable will treat that sentence as grammatical, and provide rules that account for it. A descriptive grammar of formal English would rather provide rules for "I didn't do anything."

Traditional grammar is the collection of ideas about grammar that Western societies have received from Greek and Roman sources. Prescriptive grammar is usually formulated in terms of the descriptive concepts inherited from traditional grammar. Modern descriptive grammar aims to correct the errors of traditional grammar, and generalize them, so as to avoid shoehorning all languages to the model of Latin. Nearly all materials used in teaching language, however, are still based on traditional grammar.

A generative grammar is a formal grammar that can in some sense "generate" the well-formed expressions of a natural language. An entire branch of linguistic theory is based on generative grammars. Generative grammars were popularized by Noam Chomsky. Generative grammar may include Transformational grammar, which is a broad term mostly describing natural language grammars which have been developed in a Chomskian tradition. Transformational grammar is usually synonymous with the slightly more specific transformational-generative grammar (TGG).

Grammars evolve through usage and human population separations. With the advent of written representations, formal rules about language usage tend to appear also. Formal grammars are codifications of usage that are developed by observation. As the rules become established and developed, the prescriptive concept of grammatical correctness can arise. This often creates a gulf between contemporary usage and that which is accepted as correct. Linguists normally consider that prescriptive grammars do not have any justification beyond their authors' aesthetic tastes. However, prescriptions are considered in sociolinguistics as part of the explanation for why some people say "I didn't do nothing", some say "I didn't do anything", and some say one or the other depending on social context.

The formal study of grammar is an important part of education from a young age through advanced learning, though the rules taught in schools are not a "grammar" in the sense most linguists use the term, as they are often prescriptive rather than descriptive.

It is a myth that analytic languages have simpler grammar than synthetic languages. Analytic languages use syntax to convey information that is encoded via inflection in synthetic languages. In other words, word order is not significant and morphology is highly significant in a purely synthetic language, whereas morphology is not significant and syntax is highly significant in an analytic language. Chinese and Afrikaans, for example, are highly analytic and meaning is therefore very context dependent. (Both do have some inflections, and had more in the past; thus, they are becoming even less synthetic and more "purely" analytic over time.) Latin, which is highly synthetic, uses affixes and inflections to convey the same information that Chinese does with syntax. Because Latin words are quite (though not completely) self-contained, an intelligible Latin sentence can be made from elements placed in largely arbitrary order. Latin has a complex affixation and a simple syntax, while Chinese has the opposite.